Reinforcing glass yarns with low dielectric constants
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United States of America Patent
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Issued Date -
Sep 9, 2004
app pub date -
Apr 16, 2004
filing date -
May 23, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Glass reinforcement yarn, the composition of which comprises the following constituents, in the limits defined below, expressed as percentages by weight:1 SiO.sub.2 50 to 60%, preferably SiO.sub.2 .gtoreq. 52% and/or SiO.sub.2 .ltoreq. 57% Al.sub.2O.sub.3 10 to 19%, preferably Al.sub.2O.sub.3 .gtoreq. 13% and/or Al.sub.2O.sub.3 .ltoreq. 17% B.sub.2O.sub.3 16 to 25% P.sub.2O.sub.5 0.5 to 4% Na.sub.2O .ltoreq. 1.5%, preferably Na.sub.2O .ltoreq. 0.8% K.sub.2O .ltoreq. 1.5%, preferably K.sub.2O .ltoreq. 0.8% R.sub.2O .ltoreq. 2%, preferably R.sub.2O .ltoreq. 1% CaO .ltoreq. 10% MgO .ltoreq. 10% F .ltoreq. 0 to 2% RO 4 to 15%, preferably RO .gtoreq. 6% and/or RO .ltoreq. 10% Various .ltoreq. 3%, where R.sub.2O = Na.sub.2O + K.sub.2O + Li.sub.2O, and RO = CaO + MgO. The dielectric properties of such glass compositions are particularly advantageous.
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